CLARCOR UAS DPC Benutzerhandbuch - Seite 12
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2.2.3 INSTALLATION
2.2.3.1 PRESSURE CONNECTION
Two 3/16" pressure connections are located on the back
of the unit, labeled "High" and "Low". For best results,
connect 3/16" I.D. push on tubing to the pressure
connections. If the High connection has a greater
absolute value than the Low connection, the front
display will give a positive value. If the High connection
has a lower absolute value than the Low connection,
the front display will give a negative value.
2.2.3.2 ELECTRICAL CONNECTION
3. Isolation: 4-20 mA: 5000 VAC to all other inputs and
outputs. Note: The base model does not include
the 4-20 mA option. That is a special order option.
Please contact UAS to purchase this.
2.2.4 OPERATION
2.2.4.1 DISPLAY
The DPM-A2 displays pressure on a four digit LED
display and will show three or four digits depending
on the range and accuracy of the product. Negative
pressure will be indicated by a negative sign before the
numerical indication. Units of measure are displayed
above the four digit LED display by LED indicators. The
DPM-A2 also has a process arch, which is designed
to mimic the indicating needle of a mechanical gauge.
The process arch will light up from left to right as the
pressure moves away from zero.
8
NOTES:
1. Supply Voltage is universal
from 20-240 VAC or VDC.
2. For internally sourced 4-20 mA
loop, maximum loop resistance
is 750 Ω; for externally sourced
loop at 36 VDC, maximum loop
resistance is 1800 Ω.
2.2.4.2 KEY FUNCTION
The DPM-A2 has four buttons located on the face of the
gauge for set-up and calibration. There is a Span, Zero,
Units, and Lock button. The Units button changes the
unit of measure and the Lock button locks and unlocks
the keypad on the gauge. Span and Zero are used for
calibration (see calibration section 2.2.5.2).
By simultaneously pressing the Span and Zero buttons
for three seconds, the unit will be switched from
internally sourcing the power for the current loop to
requiring an external power supply.
2.2.5 OTHER FEATURES
2.2.5.1 OPTI-LINK™
Opti-link™ is an infrared communications technology
that allows the user to upload and download
program parameters from one unit to another with
a programming key. By using the PK-01 universal
programming key, the user may program one
unit, download those parameters to the universal
programming key and then upload that same program
from the key to other controls. By using a PK-02 lockout
programming key, a user may completely lock (or
unlock) the face keypad of the control to eliminate the
possibility of unwanted tampering of the control.
2.2.5.2 CALIBRATION
ZERO - Periodically, it may be necessary to recalibrate
the gauge to maintain the accuracy of the product. To
"Zero" the gauge, remove the pressure connections
from both pressure ports and hold the Zero button for
three seconds.
SPAN - THIS FUNCTION SHOULD ONLY BE
PERFORMED BY CERTIFIED PERSONNEL.
This is a calibration parameter that allows re-calibration
of the span. To re-span the gauge, you'll need a device
that can maintain a fixed amount of negative pressure.
For example, if your gauge goes to 8" inwc, then you'll
Pulse Control Panel
DPM/DPC